Editor says, what if Pope Nicholas V formed the tenth crusade in time to lift the siege of Constantinople? muses Jeff Provine on the This Day in Alternate History web site. Please note that the opinions expressed in this post do not necessarily reflect the views of the author(s).
Editor says, in reality Nicholas V did not work to form his crusade until after the fall of Constantinople. He would never gather the necessary forces before his death, and Mehmed II would establish Constantinople as the new capital of the Ottoman Empire, which would last another four and a half centuries while dominating the eastern Mediterranean. Editorial comments are entered in [light green] typeface.